MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Brain cancer. Coloured magnetic resonance imaging (MRI) scan of a sagittal (vertical) section through the head of a child with a glioma brain cancer (large red object, centre). This is a tumour of the glia, the connective cells that make up about 40% of the brain's volume. Glioma is the most common type of tumour originating in the brain. Low-malignancy gliomas press against normal brain tissue as they grow, causing loss of brain function, including sensory disturbances, speech problems and muscle weakness. Highly-malignant gliomas invade and destroy new areas of brain. MRI scans are slice images through the body made using a strong magnet and pulses of radio waves.
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